Ways to create intersecting borders at the corners of a division

Is there a technique to expand the borders of a div by 1 or 2 pixels in each direction so that they create a cross at each corner?

https://i.stack.imgur.com/mUAxM.png

Answer №1

To achieve the desired effect, you cannot simply use the default CSS border property. Instead, consider utilizing the :before and :after selectors for the div:

<div class="cross-borders"></div>

.cross-borders {
    width:200px;
    height:200px;
    border:1px solid #000;
    border-top:0;
    border-bottom:0;
    position:relative;
    margin:20px auto;
}
.cross-borders:before,
.cross-borders:after {
    content: ' ';
    width:210px;
    height:1px;
    background-color:#000;
    position:absolute;
    top:5px;
    left:-5px;
}
.cross-borders:after {
    top: auto;
    bottom: 5px;
}

Check out this JSFiddle link for a demonstration.

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